Effect of Trivalent Additions and Processing on Structural and Magnetic Transitions in Ni-Mn-Ga Ferromagnetic Shape Memory Alloys

被引：5

作者：

Mathur, R. P. ^{[1
]}

Singh, R. K. ^{[1
]}

Ray, S. ^{[2
]}

Ghosal, P. ^{[1
]}

Chandrasekaran, V. ^{[1
]}

机构：

[1] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India

[2] Indian Inst Technol, Roorkee 247667, Uttar Pradesh, India

来源：

DEFENCE SCIENCE JOURNAL | 2012年 / 62卷 / 04期

关键词：

Ferromagnetic shape memory alloys; Ni-Mn-Ga alloys; martensitic transformation; PHASE; TRANSFORMATIONS;

D O I：

10.14429/dsj.62.1279

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Ferromagnetic shape memory Ni50Mn30Ga15Al5-xBx (x = 0, 1, and 4) alloys were prepared by vacuum arc melting and subsequent heat-treatment as well as by melt spinning to investigate the effect of trivalent element additions in ternary Ni-Mn-Ga alloys. The heat-treated alloys containing Al were reported to possess a modulated martensite structure, however alloy containing both Al and B showed a loss of modulated structure in martensite formed. The rapidly solidified alloys on the other hand showed the formation of a similar modulated structure without composition change in alloys containing Al and the alloys containing Al and B. In addition, the former showed a presence of an amorphous phase with latter showing crystalline boron rich phases. The magnetisation of the B containing alloys in both the processing technique was however very low, showing lower magnetic exchange interaction in such alloys.

引用

页码：252 / 260

页数：9

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